Personally I don't think you're sure that want one. If you were, you wouldn't be asking us what we think.
I don't see anything wrong with women getting tattoos. I have 3 of them. Pink Panther with top hat on my ankle, Pegasus on my upper right chest area, and a heart with scroll and flowers with my ex-husbands name on my back right shoulder (ya, I know). The one thing I don't like are all black tattoos on women. I think it looks to harsh and masculine. I specifically went for things with bright colors. It looks more feminine to me.
For the record, tattoos don't hurt. It can be alittle uncomfortable (not painful) at first but the area ends up going numb while they're working on it. The more meat you have on the area were you want the tattoo the less uncomfortable. When I got mine on my ankle, it was more irritating than anything else. You feel the vibration of the gun on the bone. The same with the Pegasus since the wings came up pretty close to my collar bone.
If you decide to do it, go check out a few tattoo shops first. Get an idea of what kind of work they do and if they're clean. Another thing to do is look at other peoples tattoos. You'll see that some colors hold up better than others. The color green doesn't look nice for long. It fades and turns dark.
One last thing, I HATE BUTTERFLY TATTOOS! Everybody and their mother has a butterfly. This is jmo, of course.